Not every typically "American" trait is negative, but cultural differences can lead to moments of confusion when Americans go through airport security or ask for ketchup with an order of fries in another country.

Cool Ranch Doritos have a different name

The US has enormous grocery stores

American grocery stores are huge.
REUTERS/Mike Blake

"How large grocery stores are here. My wife is not American and we lived in China and were in Hong Kong all the time ... They had large international stores that were great, and she didn't really grasp the size of American grocery stores until our first week in the USA and there's 150 feet of cereals on one aisle" — Reddit user wtjax

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The US has massive portion sizes

American portion sizes are huge.
Meredith Cash/INSIDER

"Portion sizes. [On] my high school senior trip to London, as a typically [ravenous] 18-year-old, I couldn't get over how small everything was ..." — Reddit user scott60561

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Tailgates are very American

A Denver Broncos tailgate.
Doug Pensinger/Getty Images

"Tailgates. I've lived in the states my entire life, but when my Spanish girlfriend came to visit I wasn't sure what I could show her that really exhibited American culture. There are plenty of American stereotypes you see on TV, but it wasn't until I took her to a tailgate that I realized how violently American the whole experience is. A huge parking lot full of drunk twenty-year-olds bouncing on trucks bigger than most European apartments, with half the trucks blaring country, and the other half blasting rap. Solo cups and beer cans all over the place, grills, corn hole, etc. I've traveled to quite a few different countries, and I can't really see a tailgate happening most other places." — Reddit user 11_inches_of_justice

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Red plastic cups are considered very American

Red cups are a fixture at American parties.
INSIDER

"Red plastic cups for parties. So much so that people outside the US use them as an accessory to American-themed parties." — Reddit user thiswasagutpunch

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Taking shoes off to go through airport security

Passengers take their shoes off in American airports.
AP

"Not an American, but I can always spot Americans at the airport because they take off their shoes at security even if it's not required." — Reddit user ronm4c

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"How are you?" as a greeting is confusing to foreigners

Non-Americans tend to find the greeting of "How are you?" confusing.
Justin Sullivan/Getty

"'How are you?' being used in place of 'hello' even with strangers. In the US, 'How are you?' needs only to be replied with 'Good, you?' almost as a way of saying hi. Elsewhere people don't really know how to respond when a stranger asks 'How are you?,' 'How you doing?,' or 'How's it going?'" — Reddit user Kilen13

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Free public bathrooms don't exist everywhere

Public bathrooms are numerous and free in the US.
Rick Bowmer/AP

"Free public restrooms. When I visited Europe I thought it was the strangest thing that you had to pay to use a public restroom." — Reddit user bikeboy3